An investment newsletter makes general predictions about the economy to help their clients make sound investment decisions.

$$a$)$ Recently they said that because the stock market had been up for the past three months in a row that it was$$ "due for a$$ correction" and advised their client to reduce their holdings. What$$ "law" are they$$ applying? Comment.

$$b$)$ They advised buying a stock that had gone down in the past four sessions because they said that it was clearly$$ "due to bounce$$ back." What$$ "law" are they$$ applying? Comment.